Mold for concrete set tubs



Sept. 8, 19 25 1,553,089

H. F. LIVERMORE MOLD FOR CONCRETE SET TUBS Filed Oct. 2, 1924 fnvenb w, Home r1 Liver move j W I ALE/may.

Patented Sept. 8, 1925.

.i N-ITED STATES V 1,553,089- oFFlce.

PATENT"- MOLD FOR CQNGRETE'SE'I TITBS.

Application filed ctober 2, 1924. Serial No. 741,258;

To all whom'z't'mayconcern:

" struction of an Be itknown that I, HOMER F. LIvnRMoRE,

a'citize-n of the'United States, and-a resident of Brookline, in the county of'Norfolk and Commonwealth ofMassachusetts, have 'invented certain new and useful Improvements 'in Molds for Concrete Set J Tubs, of which the following is a full, clear, and exact specification. 7 "The object of this invention is the conimproved mold for casting set tubs in one integral whole, and especially of double tubs, and the improvementsrelate to means for abolishing sharp corners within thetubs; to means for supplying the tubs with an overflow; to means for rendering the casting of the tubs more perfect, and the work more expeditious; and to other details to be hereinafter disclosed.

In the drawings forming part of this specification, Fig. 1 is a longitudinal section of a mold embodying my improvements, the section being on an irregular line. Fig. 2 is a sectional plan view of one cornerof the mold, drawn nearly full size. Fig. 3 is a sectional elevation nearly full size of the front lower portion of the mold. Fig. 4' is v a section of the strainer-casting.

In the manufacture of the set tubs Iprefer to cast themupside down, and hence what is to form the'top edges of the tubs is made close to the bottom of the mold.

For such bottom, a flat metal plate 1 is removably supported upon any suitable means, and upon the same are placed cores 2 the outer surfaces of which are toshape the inner-surfaces of the tubs, As shown in the left-hand portion of Fig. 1, these cores are hollow for the sake of lightness and economy.

' At the lower edge of each core is a slight flange 3 curving outwardly for approx mately a quadrant in order to give a rounded edge to the, finished tubs; each core being slightly tapering to enable it to be withdrawn from the hardened concrete, and a bar t being. provided therein by means of which to withdraw the core. It is, of course, understood that the front walls of the tubs are oblique in a well known way, and that the corresponding surface of each core is to a be similarly oblique, as illustrated in Fig. 3.

In addition to the cores 2, the mold comprises a front wall 5, a rear wall 6, and end walls 7 The front and back walls are formed with terminal flanges 9, and the end walls with fianges- 10;'bolts11 being used to bolt the-same together. To 'provide'the tubs with curved external corners, these walls are formed with curved flanges- 12 at their lower inner edges adapted to meet the flanges 3 the tubs, afillet 13 is provided, as shownin Fig. 2, the flanged portion 9 of the side wall being recessed to permit theunbroken fillet projecting from the end wall 7 to sweep through an entire'semi-circle and terminate flush with theinnersurface of the side wall.- VVere the fillet to be divided half-and-half between an end wall and side wall, it would practically be impossible to bolt the walls together without leaving a projecting seam which would have to be laboriously tooled off from the finished tubs. 7

As shown in Fig. 3, the cores 2 are provided with pins 14 adapted to engage holes in the foundation plate 1 for the purpose of retaining them in place thereon. After the 'is applied to the base flanges 16 of the end walls 7 and the latter tightly pressed against the flanges 3 of the cores; and other clamps, as 17 in'Fig. 3, used to firmly seat the walls upon the plate 1. The bolts 11 may now be tightened up.

To providethe tubs with an overflow, and a means for attaching the drain pipe thereto, a hollow yoke 20 has its open ends laid upon drainer-castings 21- which are placed upon the cores2, as shown in Fig. 1; this yoke having a nipple 22 for the attachment thereto of the drain pipe, and a smaller hole opposite thereto, at 23. Through this nipple and hole is passed arod24 whose lower end enters a short section of rod 25 whose ends snugly fit between the two cores. The upper end of the rod 24 has a wire nail or other suitable object thrust transversel through it for the purpose of its withdrawa Before pouring in the concrete, the walls Then the entire thing is reversed; the clamps removed; the plate 1 taken off; the cores withdrawn; the side and end walls unbolted, and the tubs set aside for perfect hardening, to be followed by sand-papering and other desired finishing. Before the reversal of the mold and its contents, the rod 24% is carefully worked out, but the rodsection 25 is not pressed out from the tub-wall until after the withdrawal of the cores.

In a set tub thus produced, not only are the surfaces smoothand all corners rounded,

' but the amount of subsequent hand work is comparatively slight; while the overflow escapes through the holes left by the rods 24 and 25 downinto the yoke 20 and thence to the drain.

The strainer-castings 21 are shown full size in section in Fig. 4.

What I claim as my invention is:

1. A mold for concrete set tubs, comprising a foundation plate, a core supported thereon, a front wall, a back Wall, end Walls, the latter having flanges bolted to the projecting terminal portions of the front and back walls, clamps firmly holding the front and back walls down upon the foundation plate, and clamps reaching beneath the foundation plate and adapted for pressing the end walls toward each other and solidly against the edges of the core.

2. A mold for concrete tubs comprising a foundation plate, avcore, side Walls and end walls, and means for fastening said parts tightly together, said means embracing a recessed flange at each corner, a flange parallel therewith and means clamping the two flanges together, the member having the second-named flange having at the termination of its inner surface a fillet-flange extending for a quarter-circle and abutting against the end-wall of the recess of said recessed flange, whereby an unbroken curve is given between two surfaces at rightangles to each other. V a

In testimony that I claim the foregoing invention, I have hereunto set my hand this 29th day of September, 19.24:.

HOMER F. LIVERMORE. 

